Del Michaels had a successful morning, or so he thinks, selling ...

[anjilletteb]

Del Michaels had a successful morning, or so he thinks, selling 1,300 surplus notebook computers over the telephone to three commercial customers. The three customers were not equally skillful at negotiating a low unit price. Customer A bought 600 computers for 1,252 each, B bought 300 units at ,1,310 each, and C bought 400 at 1,375 each.
 a. What is the average unit price at which Del sold the 1,300 computers?
  b. Del's manager told Del he expected him to sell, by the end of the day, a total of 2,500 surplus computers at an average price of 1,312 each. What is the average unit price at which Del must sell the remaining 1,200 computers?

Question 2

Many people who bought X-Game gaming systems over the holidays have complained that the systems they purchased were defective. In a sample of 1200 units sold, 18 units were defective.
 a. Determine a 95 confidence interval for the percentage of defective systems in the population.
  b. If 1.5 million X-Game gaming systems were sold over the holidays, determine an interval for the number of defectives in sales.

[ky860224]

Answer to Question 1

a. 1,303.23
b. 1,321.50

Answer to Question 2

a. .00812 to .02188 (rounded)
b. 12,184 to 32,816 (using unrounded estimates)